It is very simple to manufacture jaggery. ( other names Gur, Panela, First the sugarcane is crushed into sugarcane crusher to get sugarcane juice. Then sugarcane juice is boiled in a boiling pan by firing bagasse under the boiling pan. Single boiling pan is more economical than set of 4 boiling pans in line and flue gases pass under all the four boiling pans one after another and then escape through chimney. So I suggest single boiling pan system.